Monochoria hastata | SeedImages

Species category

Weed

Common name

arrowleaf false pickerelweed

Diagnostic characters

Planting unit

True seedTrue seed:
A mature fertilized ovule consisting of an embryo, with or without and external food reserve (e.g., endosperm) enclosed by the testa.

Shape

OvalOval:
Broadly elliptic.

Size

Length 0.6–0.8 mm
Width 0.4–0.5 mm
Thickness 0.3–0.4 mm

Color

Light brown

Texture

Ribs are longitudinal and widely spaced. TransverseTransverse:
Set crosswise, crossing or at right angles.
stipples occur between ribs.

Other structures

HilumHilum:
The scar on the seed coat at the place of its detachment from the seed stalk (funiculus).
a point at base

Identification notes

Ribs join at dark circle at seed apexApical:
The distal end of the fruit or seed away from the point of attachment or attachment scar.
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Noxious weed seed categories

Federal

Learn more on ITP's Federal Noxious Weed Disseminules tool, listed under Monochoria hastata.

AOSA examination list

Not included

Nomenclature

Family

Pontederiaceae

Valid name

Monochoria hastata (L.) Solms

Synonyms

Pontederia hastata L.

Monochoria hastata. Seeds with large, widely-spaced, longitudinal ribs. Photo by Julia Scher, USDA-APHIS-PPQ.	Monochoria hastata. Seeds with large, widely-spaced, longitudinal ribs. Photo by Julia Scher, USDA-APHIS-PPQ.
Monochoria hastata. Seeds with transverse stipples between the ribs. Photo by Julia Scher, USDA-APHIS-PPQ.	Monochoria hastata. Seeds with ribs that join at the dark circle at the apex. Photo by Julia Scher, USDA-APHIS-PPQ.
Monochoria hastata. Seeds with a pointed hilum at the base. Photo by Julia Scher, USDA-APHIS-PPQ.